---
title: "Legionella considerations in sports and fitness centres"
source_url: https://legionella.io/articles/legionella-considerations-in-sports-and-fitness-centres/
canonical_url: https://legionella.io/articles/legionella-considerations-in-sports-and-fitness-centres/
pillar: "Building Types & Use Cases"
summary: "In a gym the showers rarely drive the bill - the spa pool, steam room and mixing valves do. The three budgets behind water safety, and where spend pays back."
primary_keyword: "gym Legionella"
date_published: 2025-06-29
date_reviewed: 2026-06-26
author: "Legionella.io editorial team (REMOTE TECH LTD)"
reviewed_against: "HSE L8 and HSG274 guidance"
region: "United Kingdom"
license: "(c) REMOTE TECH LTD. Quote freely with attribution and a link to source_url."
---

# Legionella considerations in sports and fitness centres

Walk into most gyms and the water-safety effort, where there is any, points straight at the showers. Showers do matter. But in a sports or fitness centre the budget and the real exposure usually sit on the wet side — the spa pool, the steam room, the hydrotherapy plunge — where warm water and fine mist are not an accident but the entire selling point.

So the sensible way to cost gym Legionella control is to split the building into its wet side and its dry side, and fund each for the risk it actually carries. A 24-hour studio with one row of showers and a leisure centre with a spa, a sauna and a 25-metre pool are not the same problem, and they should not be handed the same budget or the same plan.

## What a gym is actually asking you to control

Strip a fitness centre back to its water and you find a collection of features that, between them, tick almost every box on the risk list. Spa pools and whirlpools are run warm by design and aerosol heavily — they are a recognised higher-risk system with their own guidance in HSG282, separate from the ordinary hot-and-cold rules [1]. The water in a spa typically sits at a temperature squarely inside the band Legionella multiplies in [2], which is exactly why these systems demand continuous chemical control and their own microbiological monitoring rather than a quarterly glance.

Then there are the showers — banks of them, used in hard bursts after a class and then idle for hours. Steam rooms and their generators produce warm aerosol on purpose. Even the swimming pool, low-risk in itself because it is chlorinated, drags in associated kit: balance tanks, backwash lines and the poolside showers. HSE's own list of systems most likely to create risk puts spa pools and showers near the top [3].

One feature is easy to miss because it is doing a good job at something else. Gyms fit thermostatic mixing valves on showers and basins to stop members scalding, which is the right call — but a TMV blends hot and cold down to a safe-to-touch temperature, and that tepid blended water sitting in the fitting between uses is close to ideal for the bacteria. TMVs need servicing and strainer cleaning at a frequency set by your risk assessment, not by the calendar [2]. Forget them and you have installed a small warm reservoir at every outlet you were trying to make safe.

## The three budgets behind a gym's water safety

Treat the spend as three buckets, not one. The usual failure is funding the first, ignoring the second, and assuming the third will never arrive.

- **Planned control — predictable, and the easy part to sign off.** The risk assessment and its reviews, a written scheme, routine temperature checks at sentinel and representative outlets, flushing of low-use showers, TMV servicing, shower-head descaling and disinfection, and staff training. The wet side adds its own layer on top: spa-pool chemistry and microbiological sampling under HSG282 [1], and sampling elsewhere where the assessment calls for it [4]. This bucket scales with how many wet-side features you run, not with floor area — which is why a small leisure centre can cost more to control than a large dry studio.

- **Friction — the bucket the budget forgets.** Peak times are exactly when you cannot take a shower block offline, so cleaning and flushing land out of hours. Flushing dozens of changing-room heads is real labour. Gyms run on shifts with high turnover, so records get chased across handovers and reception staff who were trained in March have moved on by August. A spa with drifting chemistry means downtime and re-tests. This is where a digital logbook earns its place — not as a gadget, but because manual record-chasing across shifts is itself a recurring cost ([Features of effective Legionella record-keeping software](https://legionella.io/articles/features-of-effective-legionella-record-keeping-software/) looks at what that software actually needs to do).

- **Failure — rare, but it lands on the wet side and lands hard.** A spa-pool-linked case is the nightmare scenario precisely because spa pools are a known higher-risk source: investigation, emergency disinfection, the wet side closed while members keep paying memberships they cannot use, enforcement attention, refunds and cancellations, and a reputational mark that outlasts all of it. You cannot put an honest single figure on this without inventing one, so do not — but the gap between it and the planned cost is the whole argument for funding the first two buckets properly.

The rule that falls out of this is simple. **Spend first wherever a gap both raises exposure and weakens your proof of control.** A spa pool is both. So is the accessible shower in the far corner of the changing room that is fitted for inclusion but used twice a month. That rarely-used shower is your priority pound — far more than a third annual sample on a busy outlet that constant use already keeps flushed.

## Where the spend pays back

Payback in a gym is rarely a tidy percentage. It is avoided downtime on the revenue-earning wet side and a defensible position if anyone ever asks. Three moves give the best return.

First, engineer out stagnation instead of flushing your way around it forever. Capped-off legacy outlets from an old layout, a disconnected drinking fountain, the shower nobody removed when the studio was reconfigured — these are stagnation waiting to happen, and pulling a redundant pipe once beats flushing it weekly for a decade ([Neglected water systems: the danger of stagnation](https://legionella.io/articles/neglected-water-systems-the-danger-of-stagnation/) makes that case in full).

Second, tie flushing to the timetable rather than to a generic weekly task. Low-use showers in quiet corners are the ones that get skipped, so name them and schedule them deliberately; the discipline matters more than the volume, and skipping it has a cost of its own (see [Ignoring flushing routines and the consequences](https://legionella.io/articles/ignoring-flushing-routines-and-the-consequences/)).

Third, give the wet side the attention its risk deserves and the dry side no more than it needs. Spa-pool chemistry and the steam-room generator are where consistent control buys the most safety per pound. It is also worth a look at who uses the place: many centres now court older members, post-rehab referrals and antenatal aqua classes, and severe Legionnaires' disease is more likely in older people and those with weakened immune systems or existing lung conditions [5]. Higher-risk water features and a higher-risk membership in one building is a combination worth funding around.

## Making the case to whoever signs it off

When the number goes upstairs, frame it as the three buckets and make the asymmetry plain: planned and friction costs are known and modest, while the failure cost is unbounded and lands on the wet side, on revenue and on reputation at the same time. Add the line that tends to settle it — monitoring and sampling frequency is set by the risk assessment, not chosen to hit a price point [4], so trimming it is not a saving but an acceptance of unmeasured risk.

If you do one thing this week, walk the building with a notebook and split every water feature into wet side or dry side, then mark which wet-side asset would shut the most revenue if it had to close tomorrow. That asset, not the showers, is where your first pound and your best evidence should go.

## FAQ

### In a gym, is the bigger Legionella risk the showers or the spa pool?
Usually the spa pool. Showers matter and must be controlled, but a spa is run warm, aerosols heavily and is a recognised higher-risk system with its own guidance and monitoring expectations under HSG282 [1]. The practical reading: control the showers as routine, and treat the spa as a distinct, more demanding regime rather than folding it into the general scheme [3].

### We are a budget 24-hour gym with no on-site staff — who is responsible?
The business operating the building is the duty holder and carries the responsibility, including oversight and the records that prove control [6]. Having no manager on site and using a contractor for the tasks does not move the duty; it just means your written scheme has to work without anyone standing over it. Outsourcing the work never outsources the accountability.

### Do saunas and steam rooms carry Legionella risk?
A traditional dry sauna is low risk in itself. Steam rooms are different — the generator and its feed produce warm aerosol, so the supply, generator and any associated water need to sit inside your control scheme and risk assessment rather than being treated as a fixture that looks after itself.

## Related reading

- [Ignoring flushing routines and the consequences](https://legionella.io/articles/ignoring-flushing-routines-and-the-consequences/)
- [Features of effective Legionella record-keeping software](https://legionella.io/articles/features-of-effective-legionella-record-keeping-software/)
- [Neglected water systems: the danger of stagnation](https://legionella.io/articles/neglected-water-systems-the-danger-of-stagnation/)
- [Poor temperature control: a recipe for Legionella](https://legionella.io/articles/poor-temperature-control-a-recipe-for-legionella/)

## Sources

[1] HSE, "Control of legionella and other infectious agents in spa-pool systems (HSG282)". https://www.hse.gov.uk/pubns/books/hsg282.htm
[2] HSE, "Legionnaires' disease: Technical guidance (HSG274)". https://www.hse.gov.uk/pubns/books/hsg274.htm
[3] HSE, "Systems most likely to create legionella risk". https://www.hse.gov.uk/legionnaires/risk-systems.htm
[4] HSE, "Testing and monitoring your water system for legionella". https://www.hse.gov.uk/legionnaires/testing-monitoring-water-system.htm
[5] NHS, "Legionnaires' disease". https://www.nhs.uk/conditions/legionnaires-disease/
[6] HSE, "Legionnaires' disease - what you must do". https://www.hse.gov.uk/legionnaires/what-you-must-do/index.htm